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checkbox and textbox validation prolem

I have a form with multiple checkboxes. and the checkbox has a corresponding textbox for a write in value.
I would like to make sure that the textbox can only be filled in if the corresponding checkbox is checked and if that same checkbox is then unchecked then the textbox value is cleared out.

if I checked a check box then that corresponding textfiled has to be enabled and user must enter a value in the text box,
Note:all textbox and checkbox dynamically creating.
please help me